Method and apparatus for LED driver color-sequential scan

摘要

A light emitting diode (LED) driver (4000) for an LED backlight of a color-sequential liquid crystal display (LCD) and method for operation thereof includes a plurality of LED strings (405, 410, 415) having one or more LEDs emitting light at wavelength corresponding to a predetermined color. A plurality of switches (420, 425, 430) is respectively coupled to the plurality of LED strings. A current source (440) is switchably coupled respectively and sequentially to each of the plurality of switches (420, 425, 430) by control signals (405a, 410a, 415a) to open and close the switches in a pattern that illuminates the LED strings (405, 410, 415). The switches are opened and closed sequentially to permit a respective LED string to provide an output of the predetermined color for a specific period of time such that a total output of the plurality of LED strings provides an output having the desired overall color perceived through temporal integration of an output of each respective LED string.